/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.geektimes.commons.reflect.util;

import javax.annotation.Priority;
import java.lang.annotation.Annotation;

/**
 * {@link Class} Utilities class
 *
 * @author <a href="mailto:mercyblitz@gmail.com">Mercy</a>
 * @since 1.0.0
 */
public abstract class ClassUtils {

    private ClassUtils() {
    }

    public static <A extends Annotation> A findAnnotation(Class<?> type, Class<A> annotationType) {
        if (Object.class.equals(type) || type == null) {
            return null;
        }
        A annotation = type.getAnnotation(annotationType);
        if (annotation == null) {
            // find the annotation from the super interfaces
            for (Class<?> interfaceType : type.getInterfaces()) {
                annotation = interfaceType.getAnnotation(annotationType);
                if (annotation != null) {
                    break;
                }
            }
        }

        if (annotation == null) {
            // find the annotation from the super class recursively
            annotation = findAnnotation(type.getSuperclass(), annotationType);
        }
        return annotation;
    }
}
